Track alignment “drift”

[fanatic1]

Anyone had issues with alignment values changing after a couple of track days?

Low mileage F82 and all stock suspension except for ground control camber plates. Pretty much all of the values moved around on both toe and camber front and rear.

Different shop for alignment second time, asked if anything was loose - answer was no.

[Suds]

Makes me wonder how machine settings are calibrated?
Different shops may show slightly different values, unless they were grossly different.

[MrSmartyPants]

Could be multiple things.

Calibration of the alignment racks, camber plates can shift (not common), the eccentrics in the rear can definitely slip (somewhat common).

[Remonster]

Originally Posted by MrSmartyPants

the eccentrics in the rear can definitely slip (somewhat common).

This is definitely true, I aligned my car several times within the first 4 months but then got the Fall Line locking rear toe arms and it's been dead solid for the past 8 months of extremely, extremely aggressive driving including lots of rough bumpy canyons. I haven't had an issue with my rear camber moving and the front toe arms are already a good design.